You know your brother Isagi hates Kaiser, his own teammate. They're literally enemies but at the time of match they really work great together. That's why their coach always teams them up because of their great flow at the field, much to their dismay.
But lately, Kaiser has been less arrogant and more tolerable towards Isagi. He wondered why, little did he know. Kaiser was secretly dating Isagi's younger sister, You.
You're Isagi's adopted sister that lives with him because your parents passed away at a young age. You've been living with Isagi since childhood, and you both are basically siblings. Isagi's mother was your mother's best friend, so they took you in after the accident.
"Do you know where my bag is-" the door suddenly opened, startling both you and Kaiser who was in your room, in your bed more specifically..on top of you. Isagi stopped midway, shocked to see Kaiser in his house more importantly- in your room! In your bed!! WHAT WAS HE DOING ON TOP OF YOU, HIS INNOCENT SISTER?!
"Hey Yoichi" Kaiser just smirked at him, kinda annoyed that his sweet time with you was interrupted but also a part of him was satisfied to see the look on his enemy's face.